Advanced ACTPol (AdvACT) will observe the temperature and polarization of the cosmic microwave background (CMB) at multiple frequencies and high resolution to place improved constraints on inflation, dark matter, and dark energy. Foregrounds from synchrotron and dust radiation are a source of contamination that must be characterized and removed across a wide range of frequencies. AdvACT will thus observe at five frequency bands from 27 to 230 GHz. We discuss the design of the pixels and feedhorns for the 27/39 GHz multichroic array for AdvACT, which will target the synchrotron radiation that dominates at these frequencies. To gain 35% in mapping speed in the 39 GHz band where the foreground signals are faintest, the pixel number was increased through reducing the pixel diameter to 1.08 lambda at the lowest frequency, which represents a 22% decrease in size compared to our previously most tightly packed pixels.

Simon, S., Beall, J., Cothard, N., Duff, S., Gallardo, P., Ho, S., et al. (2018). The Advanced ACTPol 27/39 GHz Array. JOURNAL OF LOW TEMPERATURE PHYSICS, 193(5-6), 1041-1047 [10.1007/s10909-018-1963-7].

The Advanced ACTPol 27/39 GHz Array

Nati F.;
2018

Abstract

Advanced ACTPol (AdvACT) will observe the temperature and polarization of the cosmic microwave background (CMB) at multiple frequencies and high resolution to place improved constraints on inflation, dark matter, and dark energy. Foregrounds from synchrotron and dust radiation are a source of contamination that must be characterized and removed across a wide range of frequencies. AdvACT will thus observe at five frequency bands from 27 to 230 GHz. We discuss the design of the pixels and feedhorns for the 27/39 GHz multichroic array for AdvACT, which will target the synchrotron radiation that dominates at these frequencies. To gain 35% in mapping speed in the 39 GHz band where the foreground signals are faintest, the pixel number was increased through reducing the pixel diameter to 1.08 lambda at the lowest frequency, which represents a 22% decrease in size compared to our previously most tightly packed pixels.
Articolo in rivista - Articolo scientifico
Advanced ACTPol; Atacama Cosmology Telescope; Cosmic microwave background; Detector design; Foregrounds; Multichroic pixel; Polarization-sensitive detector; Synchrotron; Transition-edge sensor
English
2018
193
5-6
1041
1047
none
Simon, S., Beall, J., Cothard, N., Duff, S., Gallardo, P., Ho, S., et al. (2018). The Advanced ACTPol 27/39 GHz Array. JOURNAL OF LOW TEMPERATURE PHYSICS, 193(5-6), 1041-1047 [10.1007/s10909-018-1963-7].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/247689
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